Cem 141 - Cumulative Final |60 Questions| With Correct Answers.

Refer to the Lewis structure on Figure E. What is the shape around atom Z? {Ans: Trigonal Pyramidal}Consider the claim: I2 has a higher boiling point than Br2. State the evidence and reasoning that best support this claim. {Ans: I2 has more electrons than Br2. This results in larger charges on the instantaneous dipoles in I2. Larger charges cause stronger LDFs that require more energy to overcome when it boils.}Which property of electromagnetic radiation can be explained with the double slit experiment? {Ans: The interference of light because when a beam of light passes through two small slits, the two resulting waves interfere with each other. Waves of light interfere constructively when they arrive in-phase and destructively when they arrive out-of-phase causing an interference pattern to emerge.}What happens when a covalent bond is formed between two hydrogen atoms? {Ans: Energy is released and a molecule is formed.}What causes the colored lines that appear on an emission spectrum? {Ans: The electron emits a photon when it moves from a higher to a lower energy level.}Which of the following contains the largest number of atoms? 2 moles Br2; 3 moles H2O; 5 moles I2; 6 moles He;